implement Delete TwitterUser by Id + tests

src/DataAccessLayers/BirdsiteLive.DAL.Postgres/DataAccessLayers/TwitterUserPostgresDal.cs

@@ -59,7 +59,7 @@ namespace BirdsiteLive.DAL.Postgres.DataAccessLayers
                 return result;
             }
         }
-        
+
         public async Task<int> GetTwitterUsersCountAsync()
         {
             var query = $"SELECT COUNT(*) FROM {_settings.TwitterUserTableName}";
@@ -131,5 +131,19 @@ namespace BirdsiteLive.DAL.Postgres.DataAccessLayers
                 await dbConnection.QueryAsync(query, new { acct });
             }
         }
+
+        public async Task DeleteTwitterUserAsync(int id)
+        {
+            if (id == default) throw new ArgumentException("id");
+            
+            var query = $"DELETE FROM {_settings.TwitterUserTableName} WHERE id = @id";
+
+            using (var dbConnection = Connection)
+            {
+                dbConnection.Open();
+
+                await dbConnection.QueryAsync(query, new { id });
+            }
+        }
     }
 }

src/DataAccessLayers/BirdsiteLive.DAL/Contracts/ITwitterUserDal.cs

@@ -13,6 +13,7 @@ namespace BirdsiteLive.DAL.Contracts
         Task<SyncTwitterUser[]> GetAllTwitterUsersAsync();
         Task UpdateTwitterUserAsync(int id, long lastTweetPostedId, long lastTweetSynchronizedForAllFollowersId, DateTime lastSync);
         Task DeleteTwitterUserAsync(string acct);
+        Task DeleteTwitterUserAsync(int id);
         Task<int> GetTwitterUsersCountAsync();
     }
 }

src/Tests/BirdsiteLive.DAL.Postgres.Tests/DataAccessLayers/TwitterUserPostgresDalTests.cs

@@ -128,7 +128,7 @@ namespace BirdsiteLive.DAL.Postgres.Tests.DataAccessLayers
         [TestMethod]
         public async Task CreateAndDeleteUser()
         {
-            var acct = "myid";
+            var acct = "myacct";
             var lastTweetId = 1548L;
 
             var dal = new TwitterUserPostgresDal(_settings);
@@ -150,6 +150,31 @@ namespace BirdsiteLive.DAL.Postgres.Tests.DataAccessLayers
             await dal.DeleteTwitterUserAsync(string.Empty);
         }
 
+        [TestMethod]
+        public async Task CreateAndDeleteUser_byId()
+        {
+            var acct = "myacct";
+            var lastTweetId = 1548L;
+
+            var dal = new TwitterUserPostgresDal(_settings);
+
+            await dal.CreateTwitterUserAsync(acct, lastTweetId);
+            var result = await dal.GetTwitterUserAsync(acct);
+            Assert.IsNotNull(result);
+
+            await dal.DeleteTwitterUserAsync(result.Id);
+            result = await dal.GetTwitterUserAsync(acct);
+            Assert.IsNull(result);
+        }
+
+        [TestMethod]
+        [ExpectedException(typeof(ArgumentException))]
+        public async Task DeleteUser_NotAcct_byId()
+        {
+            var dal = new TwitterUserPostgresDal(_settings);
+            await dal.DeleteTwitterUserAsync(default(int));
+        }
+
         [TestMethod]
         public async Task GetAllTwitterUsers_Top()
         {